Universal lathe tool post



April 24, 1945. A. F.' FEASTER 25,374,477

` UNIVERSAL LATHE TOOL POST Filed May 8, 1944 Arron/vcr Patented Apr. 24, 1945 UNITED STATES ,PATENT OFFICE, `g

UNIVERSAL LATHE 'rooL` Pos'r Auen Feaster, Boulder, com. Application May 8, 1944, Serial No. 534,646

s Claims. l(ol. 82%12) This invention relates to a tool post for lathes and has for its principal object the provision of a simple and highlyeilicient attachment which can be quickly and easily placed in a standard compound lathe tool rest for turning spherical convexities and arcuate concavities in the work;

A further object is to provide a tool-post` forV the labove special purposes which can also be used for holding the tool for any of the usual work required of alathe. i

Other objects andadvantages reside inthe detail construction of the invention, which is designed for simplicity, economy, and elliciency. These will become more apparent from the following description.` Y l 1 `In the following detailed description of the invention reference is had to the accompanying drawingwhich forms a part hereof. Like numeralsrefer to like parts in all views of the drawing and throughout the description.

Fig. 1 is a side view of the improved tool post illustrating' it in'position on a standard compound toolrest;

Fig. 2v is a plan View thereof 'in place in the tool rest;

Fig. 3 is a cross-section through the improved tool post,` taken on the line 3-3, Fig. 2, with the rest eliminated;

Fig. 4 is a rear view of the improvedpost;

Fig. 5 is a fragmentary sectional View illustrating an alternate method of constructing the post; and

Fig. 6 is a detail view illustrating a type of work to which the improved :post is adapted.

A typical standard compound tool rest is illustrated on the drawing yat I0 with its dove-tailed, post-receiving channel at I I, and transverse feed crank at I2. The improved tool post is designed to t into the dove-tailed channel II of the standard compound rest.

The improved post employs a pivot post I3 having an enlarged foot portion I4 designed to slidably engage in the dove-tailed channel II of. the rest Ill. The `upper pontion of the pivot post is reduced in diameter to form a pivot bearing for a swinging base member I5. The pivot bearing of the post I3 contains a peripheral groove lli into which one or more round-nosed set screws I'I project to prevent removal of the base. By tightening these screws, the base can be accurately set any any desired angle about the pivot post I3. f

The'pivo-t post may be locked in the channel ,II at any desired point by means of a central hollow set screw I8 which passes axially and Verticallythrough the post and which can be brought to bear against the bottom of the channel II to clamp the foot portion I4 in the dovetail of the channel. I

The base I5 extends to one side of the pivo post and carries a clamp member I9 at its projecting extremity. The member I9 is drilled to receive a toolbar and this drill hole is split at one side, as indicated `at 2l. Two cap screws 22 secure the member I9 to the base I5 and, when these screws are tightened, the drill hole in the member will be contracted aboutthe bar 20 to lock the latter in any `desired position therein.

The forward extremity of the bar 20 is threaded into `or otherwise secured toa tool block 23 which slidesupon the base I5. The forward extremity of the tool block contains an inclined tool channel 24 in which any desired turning tool 25 may be clamped by means of a clamp screw 26.

When `used for turning `a ball, such asindi- I cated at A in Fig. 6, the axis of the -pivot post I3 is placed immediately below the center of the ball A. The tool is fed to the Work by the crank I 2 and it is fed around the work by swinging the bar 20 from side to side, as indicated by i the center lines C and D in Fig. 2, to cut away the excess material to produce aperfect sphere. A complete sphere such as illustrated at A in Fig. 6 may be producedby swinging the bar completely around to the center line of the work.

For turning a concavity, such as indicated at B in Fig. 6, the axis of the post I3 is placed at the axis Iof the concavity and the tool 25 is moved forwardly by adjusting the bar 20 until` ing the tool block 23 is illustrated. In this method a threaded feed bar 2'I is employed which is threaded through an upstanding flange 28 on a swingable base member 29. The threaded hole in the ange 28 can be contracted about the bar 21 by means of a clamp screwV 30 to lock The downward pressure on` While a specic form of the improvement hask been described and illustrated herein, it is desired to be understood that the same may be varied, Within the scope of the :appended claims,

without departing from the tion.

Having thus described the invention, what is claimed and desired secured by Letters Patent 1s:

spirit of the invenl. A tool post for lathes comprising; a pivot i member; an enlarged foot on said pivot member to be positioned in the post` channel of a lathe rest; a base pivotally mounted on said pivot member; a tool holding block slidably mounted on said base; and means for locking said block in any desired position on said base.

2. A tool post for lathes comprising; a pivot memben an' enlarged foot on said pivot member tov be positioned in the postl channel of a lathe` rest; a base Ipivotally 'mounted on said pivot member; a tool holding` block slidably mounted on said base; a bar projecting from said block radially of said pivot member; andmeans for locking said bar to said base at any desired position of the former.

3. A toolvpost for lathes comprising: a. pivot member; an enlarged foot on said pivot member to be positioned in the post channel of a lathe rest; a base pivotally mounted on lsai-d pivot member; a tool holding [block slidably mounted on said base; a bar projecting from said block radially of said pivot member; an vupstanding member secured to said base about said bar, the latter being slidable therethrough;

and means for locking said bar in said upstanding member;

4-. A tool post for lathes comprising: a pivot member; an enlarged foot on said pivot member to be positioned in the post channel of a lathe rest; a base pivotally mounted on said pivot member; a tool holding block slidably mounted on said base; and means for locking said block in any desired position on said base, said block being movable radially across the axis of said pivot member.

5. A tool post for lathes comprising; a pivot member; an enlarged foot on said pivot member to be positioned inthe post channel of a lathe rest; a base pivotally mounted on said pivot member; meansvfor supporting a toolon said base; and a set screw extending vertically through said pivot member to be brought into contact with the bottom of said channel to lock said pivot member in place therein.

'GQ A tool post for lathes comprising: a pivot y,memben anuenlarged foot on said pivot member tobe positioned in the post channel of a 'lather'estva base member extending to one side of said pivot member; a bearing formed on said pivot member, said base having an opening for receiving said bearing; a tool holding block on saidrbasef member; and means for adjusting the position of said block on said base'member in a planeradial to the axis of said pivot member.

7.v A tool post for lathes comprisinga pivot member; an enlargedr `foot on said pivot member to be positioned in the post channel of a lathe rest; a base member extending to oneside of` said pivot member; a bearing formed on said pivot member, said base having an openingl for receiving said bearing; .a tool holding block. on said base member; means for adjusting the posi-- tionof said block onsaid basefmember in aplan-e radial to theaxis of said pivot; and means for locking said base at any desiredfradial posi-tion about said pivot post.

8; Ay tool post for lathes compri-sing: a pivot member; an enlarged foot onv said pivot member to be positioned in the post channel of alathe rest; a base member extending to one side of said pivot member; a bearing formed on said pivot member, said base having any opening for receiving-said bearing; aI toolholding block on said base member; means for adjusting the position of said block onlsaidbase member in-v a plane radial to the axis of said pivot member;v and setl screws projecting radially inward from said base to-said pivot member, there being a peripheral groove in the latter for the reception. of. said screws. f

, ALLENI. 

